Redux: How to test a connected component?
As you pointed out, the way I usually do this is to export the un-connected component as well, and test that.
i.e.
export {Login};
Here's an example. Source of the component, and source of the tests.
For the wrapped component, I don't author tests for those because my mappings (mapStateToProps
and mapDispatchToProps
) are generally very simple. If I wanted to test a wrapped component, I'd really just be testing those maps. So those are what I would choose to explicitly test, rather than re-testing the entire component in a wrapped form.
There are two ways to test those functions. One way would be to export the functions within the module itself.
i.e.;
export {mapStateToProps, mapDispatchToProps}
I'm not a huge fan of this, because I wouldn't want other modules in the app to access them. In my tests, I sometimes use babel-plugin-rewire to access "in-scope" variables, so that's what I would do in this situation.
That might look something like:
import {
Login, __Rewire__
}
const mapStateToProps = __Rewire__.__get__('mapStateToProps');
describe('mapStateToProps', () => { ... });
This is an interesting question.
I usually do import both container and component to do the testing. For container testing I use, redux-mock-store
. Component testing is for testing async functions. For instance in your case, login process is an async function using sinon
stubs. Here is a snippet of the same,
import React from 'react';
import {Provider} from 'react-redux';
import {mount, shallow} from 'enzyme';
import {expect} from 'chai';
import LoginContainer from '../../src/login/login.container';
import Login from '../../src/login/Login';
import configureMockStore from 'redux-mock-store';
import thunk from 'redux-thunk';
import { stub } from 'sinon';
const mockStore = configureMockStore([thunk]);
describe('Container Login', () => {
let store;
beforeEach(() => {
store = mockStore({
auth: {
sport: 'BASKETBALL',
},
});
});
it('should render the container component', () => {
const wrapper = mount(
<Provider store={store}>
<LoginContainer />
</Provider>
);
expect(wrapper.find(LoginContainer).length).to.equal(1);
const container = wrapper.find(LoginContainer);
expect(container.find(Login).length).to.equal(1);
expect(container.find(Login).props().auth).to.eql({ sport: 'BASKETBALL' });
});
it('should perform login', () => {
const loginStub = stub().withArgs({
username: 'abcd',
password: '1234',
});
const wrapper = mount(<Login
loginUser={loginStub}
/>);
wrapper.find('button').simulate('click');
expect(loginStub.callCount).to.equal(1);
});
});